Continuity mistake: When Neo wakes up in the station, he is sometimes right next to the edge of the platform and sometimes further from it. (00:04:10)
Continuity mistake: At the beginning of the movie when Trinity and Morpheus first go to visit the Oracle, if you look behind them there are two wooden frames that are on the back wall where Seraph is, then a few shots later they are on the wall where Trinity and Morpheus walked in. (00:04:55 - 00:05:30)
Continuity mistake: Sati and her family leave one suitcase when they get on the train (the one Neo was carrying), but when the train comes back and Trinity steps out, there is no suitcase. It can't have gone anywhere - as we see when Neo tries, the only way out is on the train, otherwise you're caught in a loop. (00:14:05 - 00:24:00)
Continuity mistake: When Trinity, Morpheus and Seraph go to see the Merovingian in his club, there is a fight scene before they enter the club. When Trinity kicks the guy at the end of the fight scene, the guy has his arms by his side. In the following shot they are now outstretched. (00:17:00)
Continuity mistake: When Trinity is meeting with the Frenchman, the olive in his martini changes. In the first close-up shot, he only has one green olive on the cocktail stick. From then on he has two, until he eats one. (00:19:50)
Continuity mistake: As the three start to fight at the Merovingian's club: after Trinity snaps there is a shot of Seraph pushing someone down as the man in black pulls the gun on him. To the right, there is a guy who is hurled to the floor by Trinity. In the next shot, Trinity hurls the man again. (00:21:30)
Continuity mistake: In the scene where Neo sees the oracle at her home, as the shots go back and forth during the dialog immediately after she sits down, her cigarette pack goes from closed to slightly open several times, until she takes a cigarette, then it stays slightly open. (00:25:00)
Continuity mistake: In the scene where Neo is talking with the Oracle in her apartment, the Oracle sits down at the table, picks up a bracelet, and right before the shot changes, you can see that it is on her hand, almost to the thumb area. When we cut back to her a second later, the bracelet is back on the table, and she picks it up and puts it on again. (00:26:10)
Continuity mistake: Just after Neo has seen the Oracle he is jacked out Trinity says "How are you feeling, are you alright?", her hand is on Neo's shoulder. The following shot her hand is on his back, then back to his shoulder. (00:29:10)
Continuity mistake: In the middle of the film when the captains and crews of both ships are discussing routes, the first shot we see Niobe. Behind her there is a guy at the side of her with a grey like t-shirt or jumper. The following shot he is standing behind her. (00:42:05)
Continuity mistake: Near the beginning when we see Neo walk into the room where the captains, Morpheus, Trinity, and the others are, if you look at Trinity she is standing behind Link in one shot, then he is standing behind her in another, and it is like this for several shots. (00:42:50)
Continuity mistake: As everyone is saying their goodbyes before entering the ships to go off to war, Neo's interface sockets on his spine keep appearing and disappearing during angle changes. (00:48:00 - 00:49:40)
Continuity mistake: In the scene where the "Smith infected" Bane has the scalpel to Trinity's neck, we first see Bane's head just right beside Trinity's lips (on the side). But in the next shot, Bane's head is way back near Trinity's neck still holding the scapel. (00:51:00)
Continuity mistake: In the scene where Bane has the scalpel to Trinity's neck, the bloody mark below it keeps disappearing and reappearing. The scalpel changes positions too as well as the blade itself changes. (00:52:55)
Continuity mistake: When Smith, in the flesh, has Trinity with a knife at her throat, one scene has a blood mark on her neck. The next scene, a moment later, shows the blood mark gone. (00:53:04)
Continuity mistake: After Neo has been blinded, his eyes and everything around them is burned and red. Right after the fight, when Trinity sees him blind for the first time, his eyes (or eyelids) are grey, and only the rest is red. (00:56:55 - 00:57:40)
Continuity mistake: Close to the end of the film when some of the people from Zion are trying to blow the legs off of the diggers, in one particular shot you can see that they only load the right side of the rocket launcher, but in the next shot both sides are loaded. (01:03:00)
Continuity mistake: When the Logos plummets from the sky and crashes into the machine tower, Trinity is skewered with cables. In slo-mo you can see that at least two cables penetrate her upper chest, but when Neo is lying next to her a minute later the cables have impaled her below the ribcage and there are no chest wounds. (01:32:20 - 01:33:45)
Continuity mistake: During the big rain fight scene between Neo and Smith, Neo punches Smith, who flies into the road making a large dent/scrape. In the next shot, when they are flying above the road, the damage is nowhere to be seen. No other damage is repaired throughout this fight. (01:43:40)
Continuity mistake: Towards the beginning of the Super Burly Brawl scene (right after Agent Smith gets knocked down on the road), Agent Smith and Neo fly up in the air and collide with each other, causing a massive surge of water to spread out as if a bomb went off. The water then falls back down on the Agent Smith clones, who are now looking up. But if you pay close attention it seems like they are completely dry, despite the fact that they have been standing in the rain and are all soaked. (01:43:50)
Answer: They never wanted to have the possibility of it getting set off accidentally, as it would render the entire dock area (and possible more) inert instantly. In fact, they probably weren't terribly prepared for the Sentinels ever to find/reach their location. In 100 years, they hadn't yet.
Rooster of Doom